SNAI1 and carcinoma: Whereas miR‐34 downregulates Snail1 expression, the best‐studied transcriptional inducer of Snail1 expression, and of EMT, in a variety of carcinomas is the TGFβ signaling pathway (Barrallo‐Gimeno and Nieto, 2009; Moustakas and Heldin, 2012).